Portrayal of a real-life figure Father Gabriele Amorth, a priest who acted as chief exorcist of the Vatican and who performed more than 100,000 exorcisms in his lifetime. (He passed away in 2016 at the age of 91.) Amorth wrote two memoirs -- An Exorcist Tells His Story and An Exorcist: More Stories -- and detailed his experiences battling Satan and demons that had clutched people in their evil.